#243E69
Closest named color: Twilight Blue (#0A437A). oklch(36.6% 0.081 260), rgb(36, 62, 105).
Aa
White text reads best on this color (10.67:1).
About this color
#243E69 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.081 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.033 away. White text reads best on it, at 10.67:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.081) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.96:1 |
| White text | 10.67:1 |
Values
| HEX | #243E69 |
| RGB | rgb(36, 62, 105) |
| HSL | hsl(217, 49%, 28%) |
| OKLCH | oklch(36.6% 0.081 260) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #243E69 | 10.67:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #243E69 | 1.96:1 | Fails | Lc 9.4 | Not readable |
| #243E69 text on white | 10.67:1 | AAA | Lc 94.6 | Preferred for body text |
| #243E69 text on black | 1.96:1 | Fails | Lc -8.0 | Not readable |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 900.
-
Step 50
50
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EAF6
oklch(93.5% 0.018 261.3)
-
Step 200
200
#CCDAF0
oklch(88.5% 0.034 259.4)
-
Step 300
300
#AAC2E9
oklch(80.9% 0.061 260.1)
-
Step 400
400
#7DA1DD
oklch(70.6% 0.097 260.4)
-
Step 500
500
#5B89D4
oklch(63.1% 0.124 259.8)
-
Step 600
600
#4171C1
oklch(55.5% 0.135 260)
-
Step 700
700
#335FA7
oklch(49.2% 0.125 259.8)
-
Step 800
800
#2B4E87
oklch(42.8% 0.103 259.7)
-
Step 900
900 (this color)
#243E69
oklch(36.6% 0.081 260)
-
Step 950
950
#17263F
oklch(26.9% 0.051 260.2)
#243E69 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #2B426B | 0.016 |
| Deuteranopia (no green cones) | #223B68 | 0.010 |
| Tritanopia (no blue cones) | #00484E | 0.069 |
| Achromatopsia (no color) | #3E3E3E | 0.081 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243E69
#243E69
oklch(36.6% 0.081 260)
- #533900
#533900
oklch(36.5% 0.076 80)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #243E69, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.033
- Marine Blue #01386A ΔE 0.036
- Dark Grey Blue #29465B ΔE 0.040
- Prussian Blue #1D3557 ΔE 0.041
- Dark Blue Grey #1F3B4D ΔE 0.050
- Charcoal #264653 ΔE 0.052
- Midnight Green #073B4C ΔE 0.059
- Marine #042E60 ΔE 0.062
Use #243E69 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.